How to create feather wings and attach them on sphere?
Using your reference image, here is a quick solution:
Under the Properties panel in the 3D viewport, enable Background Images, then click Add Image. Pressing Open will bring you to a file browser; here, select your winged ball image.

Switch to orthographic view (5 on the numpad), than press (on the numpad) 7.
Add a plane, then go into edit mode. Select all of the points but one and delete them. Move the point to the edge of the wing in the picture. Then, pressing E (for extrude) make a line around the wing. After getting to the end, select both end points and press F to fill in a line.

The line is finished along the whole wing:

Now that the whole outline is created, press F to fill the area with a face.
Exit &quot;Top Orthographic&quot; view. Press E while the whole outline is selected to extrude the outline and add depth to the wing.
Here is the finished wing:

Here is what I made with this:

Hope this helps!